package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.elasticsearch.pojo.SkuInfo;
import com.changgou.entity.PageResult;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    private ElasticsearchTemplate esTemplate;

    @Override
    public Map search(Map<String, String> searchMap) {

        //最终要返回的Map
        Map<String, Object> resultMap = new HashMap<>();

        if (searchMap != null) {
            //构建查询条件
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();



            //按照关键字查询
            if (StringUtils.isNotEmpty(searchMap.get("keywords"))) {
                boolQuery.must(QueryBuilders.matchQuery("name", searchMap.get("keywords")).operator(Operator.AND));
            }

            //按照品牌进行过滤查询
            if (StringUtils.isNotEmpty(searchMap.get("brand"))){
                boolQuery.filter(QueryBuilders.termQuery("brandName",searchMap.get("brand")));
            }

            //按照规格进行过滤查询
            for (String key : searchMap.keySet()) {
                if (key.startsWith("spec_")){
                    String value = searchMap.get(key).replace("%2B","+");
                    //spec_网络制式
                    boolQuery.filter(QueryBuilders.termQuery(("specMap."+key.substring(5)+".keyword"),value));
                }
            }

            //按照价格区间进行过滤查询
            if (StringUtils.isNotEmpty(searchMap.get("price"))){
                String price = searchMap.get("price");
                String[] prices = price.split("-");
                if (prices.length==2){
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }


            nativeSearchQueryBuilder.withQuery(boolQuery);

            //按照品牌分组（聚合）查询
            String skuBrand = "skuBrand";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //按照规格进行聚合查询
            String skuSpec = "skuSpec";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //分页查询
            String pageNum = searchMap.get("pageNum");
            String pageSize = searchMap.get("pageSize");
            if (StringUtils.isEmpty(pageNum)){
                pageNum = "1";
            }
            if (StringUtils.isEmpty(pageSize)){
                pageSize = "30";
            }
            //设置分页
            //第一个参数是当前页 从零开始
            //第二个参数是每页显示的条数
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum) - 1, Integer.parseInt(pageSize)));


            //按照相关字段进行排序查询
            //1.当前域 2.排序方式（升序ASC、降序DESC）
            if (StringUtils.isNotEmpty(searchMap.get("sortField")) && StringUtils.isNotEmpty(searchMap.get("sortRule"))){

                if ("ASC".equals(searchMap.get("sortRule"))){
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.ASC));
                }else {
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(searchMap.get("sortField")).order(SortOrder.DESC));
                }

            }

            //高亮
            HighlightBuilder.Field field = new HighlightBuilder
                    .Field("name")
                    .preTags("<span style='color:red'>")
                    .postTags("</span>");
            nativeSearchQueryBuilder.withHighlightFields(field);


            AggregatedPage<SkuInfo> resultInfo = esTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
                    //封装查询结果
                    List<T> list = new ArrayList<>();

                    SearchHits hits = searchResponse.getHits();
                    if (hits != null) {
                        for (SearchHit hit : hits) {
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);
                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (highlightFields!=null&&highlightFields.size()>0){
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }

                            list.add((T) skuInfo);
                        }
                    }
                    return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(), searchResponse.getAggregations());
                }
            });

            //封装最终返回的Map

            //总记录数
            resultMap.put("total", resultInfo.getTotalElements());

            //总页数
            resultMap.put("totalPages", resultInfo.getTotalPages());

            //数据集合
            resultMap.put("rows", resultInfo.getContent());

            //封装品牌聚合查询结果
            StringTerms brandTerms = (StringTerms) resultInfo.getAggregation(skuBrand);
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList",brandList);

            //封装规格聚合查询的结果
            StringTerms specTerms = (StringTerms) resultInfo.getAggregation(skuSpec);
            List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            //格式化规格结果，并存入resultMap中
            resultMap.put("specList",this.formartSpec(specList));

            //封装当前页数
            resultMap.put("pageNum",pageNum);

            return resultMap;
        }

        return null;
    }

    /**
     * 格式化参数结果
     * @param specList
     * @return
     */
    public Map<String, Set<String>> formartSpec(List<String> specList){
        Map<String,Set<String>> resultMap = new HashMap<>();

        if (specList != null && specList.size() > 0){
            for (String specJsonString : specList) {
                Map<String,String> specMap  = JSON.parseObject(specJsonString, Map.class);
                for (String specKey : specMap.keySet()) {
                    Set<String> specSet = resultMap.get(specKey);
                    if (specSet == null){
                        specSet=new HashSet<String>();
                    }
                    specSet.add(specMap.get(specKey));
                    resultMap.put(specKey,specSet);
                }
            }
        }


        return resultMap;
    }
}
